I have Mustang or PBR front calipers on the front wheels.I also have 96 corvette rear calipers in the rear.The rotors are 12x1.18 front and 12x,75 in the rear. I have 3000gt wheels that are 16x8" rims.I hade to grind the front calipers and clean up the rims to fit.You can look at my photos gallery onwww,dsmtuners.comI am pagosa dsm there.

I had PBR's on my HKS 1g Promo car. I had 17x8 BBS wheels and they would clear just fine. They were +39 offset. I think you may be cutting it close with +45. Some small spacers may hel if needed and its just a bit.

My initial test fit with the wheel showed some slight rubbing on the fins, but it definitely wouldn't clear the wheel weights.

From what I could tell, going to a +35 wheel wouldn't have helped clearance on the wheel weights. Is that 1-2mm of clearance between the caliper and the inside rim enough? I think I have enough spoke clearance without spacers. It's the actual rim clearance I'm worried about.

Once it's all tightened down you should have 0 flex so if it clears it's good. Look at the stock calipers. You can barely slide a toothpick between them and the stock rims. If you've got a few mm when it's all said and done I'd call it a win and then just watch the inside of the wheels for signs of scraping.